kidney bean 
noun
A kidney-shaped bean, especially a dark red one from a dwarf French bean plant.At this time his body was smaller than a kidney bean, and just beginning to form limb buds - his future arms and legs....
- The active ingredient in these products is an extract derived from a white kidney bean called Phaseolus vulgaris.
- I was newly pregnant with my first child, whose embryo was about the size of a kidney bean.
- batrachian
- batrachotoxin
- bat ray
- bats
- batshit
- batsman
- batsmanship
- bat something around (or about)
- bat stingray
- batt
- battalion
- Battambang
- battels
- battement
- batten
- Battenberg
- Battenberg cake
- batten down the hatches
- battening
- Batten, Jean
- batter
- battered
- battered child syndrome
- battered sav
- battered woman syndrome